Every ATC on earth - Danish, Swedish, Polish, Balitc and so on, can see every plane in the air, regardless if they fly with the transponder on. They can see its height and speed
Either the tanslation is misleading of the Ambassador was fed wrong info possibly for a purpose. As MH270 showed it is unfornutaley not the case.
That said, like in the previous case I think someone in Sweden is blowing this out of proportion in the media , also for a purpose.